"Post-Apocalyptic Warsaw" - Actually, this still looks a little early for the Fifth World. This is probably only 100 or 200 years in. After 400 years, most of those tall buildings would've fallen over.
Walker Encounter Created by Robert Balderson. I completely forgot that there is a well known artist with last name of Balderson. I don't know that he's related or how he is, but will find out eventually in research. And Star Wars!